package com.sky.aspect;

import com.sky.annotation.Autofill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

//自定义切面，实现公共字段自动填充
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    //切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.Autofill)")
    public void autoFillPointCut(){

    }
    //自定义的前置通知
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        log.info("开始进行公共字段的自动填充。。。");
        //获取到当前被拦截的方法上的数据库操作类型
        MethodSignature signature=(MethodSignature) joinPoint.getSignature();//方法签名对象
        Autofill autofill=signature.getMethod().getAnnotation(Autofill.class);//获得方法上的注解对象
        OperationType operationType=autofill.value();
        //获取到当前被拦截的方法参数--实体对象
        Object[] args=joinPoint.getArgs();
        if(args==null||args.length==0){
            return ;
        }
        Object entity=args[0];
        //准备赋值的数据
        LocalDateTime now=LocalDateTime.now();
        Long currentid= BaseContext.getCurrentId();
        //准备赋值
        if(operationType==OperationType.INSERT){
           Method setCreateTime= entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
            Method setCreateUser= entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
            Method setUpdateTime= entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
            Method setUpdateUser= entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
            //通过反射为对象属性赋值
            setCreateTime.invoke(entity,now);
            setCreateUser.invoke(entity,currentid);
            setUpdateTime.invoke(entity,now);
            setUpdateUser.invoke(entity,currentid);
        }
        else if (operationType==OperationType.UPDATE){
            Method setUpdateTime= entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
            Method setUpdateUser= entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
            setUpdateTime.invoke(entity,now);
            setUpdateUser.invoke(entity,currentid);
        }
    }


}
